Line items represent financial concepts included in a table. These concepts are used to disclose reportable information associated with domain members defined in one or many axes to the table.

No definition available.

Name:	us-gaap_ShareBasedCompensationArrangementByShareBasedPaymentAwardLineItems
Namespace Prefix:	us-gaap_
Data Type:	xbrli:stringItemType
Balance Type:	na
Period Type:	duration

Summary of Grant Date Fair Value of Awards Issued Based on Valuation Assumptions (Parenthetical) (Detail)	Feb. 23, 2016	Jan. 07, 2016
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock price volatility, historical stock price term		2 years 11 months 23 days
Mr. Haugh
Share Based Compensation Arrangement By Share Based Payment Award [Line Items]
Stock price volatility, historical stock price term	3 years